(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

This guide provides a more detailed description of the syntax that is supported along with examples.

This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.

Concept Search - What can I type?

For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.

Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.

Electromagnetic Acoustic Resonance Spectrometer

Publishing Venue

IBM

Related People

Tam, AC: AUTHOR

Abstract

Described here is a new technique and apparatus for nondestructive evaluation (NDE) of a mechanical assembly containing one or more ferromagnetic elements. This technique is called "Electromagnetic Acoustic Resonance Spectrometry" (EMARS), because it relies on the use of an electromagnetic field that is scanned in frequency to seek out mechanical resonances in a mechanical assembly; the positions and the widths provide a "fingerprinting" information on the size and shape and structural and material properties of the assembly. The word "spectrometry" is used here (as is common in the field of optics) to indicate that the frequency of the sinusoidal variation of the field is scanned to obtain acoustic resonance line positions and shapes. An embodiment is indicated in the figure.

Country

United States

Language

English (United States)

This text was extracted from a PDF file.

At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
52% of the total text.

Page 1 of 2

Electromagnetic Acoustic Resonance Spectrometer

Described here is a new technique and apparatus for nondestructive evaluation
(NDE) of a mechanical assembly containing one or more ferromagnetic
elements. This technique is called "Electromagnetic Acoustic Resonance
Spectrometry" (EMARS), because it relies on the use of an electromagnetic field
that is scanned in frequency to seek out mechanical resonances in a mechanical
assembly; the positions and the widths provide a "fingerprinting" information on
the size and shape and structural and material properties of the assembly. The
word "spectrometry" is used here (as is common in the field of optics) to indicate
that the frequency of the sinusoidal variation of the field is scanned to obtain
acoustic resonance line positions and shapes. An embodiment is indicated in the
figure. A simple high-frequency electromagnet with high spatial resolution was
made by wrapping 50 turns of thin formvarcoated copper wire onto a
ferromagnetic rod (e.g., steel rod) to enhance and localize the field. The output
from a sweep oscillator (producing 20 V peak-to-peak sinusoidal oscillations of
frequency f scannable from 0.1 to 10 MHz) was connected to the copper coil and
also to a frequency counter to measure the instantaneous frequency (if the
scanning time is long compared to the integration time of the counter). The
sample used in the present demonstration was a porous ferromagnetic object of
approximate dimensions 3x5x22 mm but with large surface pores and
protrusions. It was in acoustical contact with an ultrasonic transducer of the lead-
zirconate-titanate type that had frequency response up to a few MHz. The
transducer output was amplified by 26 dB and displaye...